I personally own a large portfolio here in Memphis and I hired a property manager for the very first proeprty and I still use them today. 

38116 and 38118 are the areas Im referring to and I have a Podcast where I break down the stats and all details of those areas.

From personal experience, this can motivate them to do a final deep clean before handing over the keys.Finally, for peace of mind, you might consider consulting a local real estate attorney.

My lease has a sublet fee (2 weeks is guest by lease more than 2 weeks in a year is sublet) that is costly enough ($100/night per person which is about what a cheaper hotel is here) that makes sure tenants do not have others move-in without informing us.

I refer some clients to them.

It seems like PSI has grown, a couple landscape companies that way either sold or partnered with PSI because these landscape companies no longer do snow removal and refer people to PSI.  

How would you recommend, or what resources would you refer for us to properly figure out how we spend our time and appropriately get compensated for it?

This is the BEST $100 you will ever spend, and if you listen to Amanda Han's tax book, you'll know it's also likely a business expense for you to write off :) https://biggerpockets.supercast.com/My perfect way to learn from the BP books is to listen to the audio book through the subscription above, then books that really stand out to me I go old school and get the physical copy so that I can re-read it, take notes in the margins, and put post it notes so key points are easier for me to re-reference in the future.

Furthermore, @Dave Meyer has a YouTube show/podcast on market trends for your reference.

This not only refers to lay people; attorneys also can invest with no research.